Kaggy's spirit nuke is indeed powerful, but it has huge delay, and it doesn't buff anybody. Buffing a ko in 3 steps, megawatt cannon, croaking frog, spring like suika, etc by 30% should prove to be compareably powerful, with the added bonus of 30% more speed, mnd, def as well as atk/mag. Why dump all her level up stats into mag just do do compareable damage to those characters when you can have a more defensive kaggy,and STILL do compareable damage (using the buff).
Granted she'll be less useful for trash yes, but she'll still be more than capable to ko helbelmeres, yellow kings, and those 27f crabs that are hard as @#%@#% to damage (as soon as you reach the floor to boot)
Pumping her mind allows her to stay out safely for long periods of time..Alas, she'll still be needle parade chow, and in some cases arrow rain chow.